Washington (CNN) -- The House of Representatives voted unanimously Thursday to impeach Judge G. Thomas Porteous Jr. of U.S. District Court for the Eastern District of Louisiana, making him the nation's 15th federal judge ever impeached.

"Our investigation found that Judge Porteous participated in a pattern of corrupt conduct for years," said U.S. Rep. Adam Schiff, D-California, chairman of the House Judiciary Committee Task Force on Judicial Impeachment.

"Litigants have the right to expect a judge hearing their case will be fair and impartial, and avoid even the appearance of impropriety. Regrettably, no one can have that expectation in Judge Porteous' courtroom."

After the impeachment vote, Schiff and Rep. Bob Goodlatte, R-Virginia, were named the lead impeachment managers for the Senate trial, which will decide whether to remove Porteous from the bench.

"Today's vote marks only the second time in over 20 years that this has occurred," Goodlatte said in a House news release. "However, when evidence emerges that an individual is abusing his judicial office for his own advantage, the integrity of the entire judicial system becomes compromised."

In a statement, Porteous' lawyer Richard W. Westling said the Justice Department had decided not to prosecute because it did not have credible evidence.

"Unfortunately, the House has decided to disregard the Justice Department's decision and to move forward with impeachment. As a result, we will now turn to the Senate to seek a full and fair hearing of all of the evidence."

In a telephone interview, Westling said he did not know when the Senate trial would be held. "There are no clear rules that dictate timing," he said.

Last year, the Task Force on Judicial Impeachment held evidentiary hearings that led to unanimous approval of the four articles of impeachment, citing evidence that Porteous "intentionally made material false statements and representations under penalty of perjury, engaged in a corrupt kickback scheme, solicited and accepted unlawful gifts, and intentionally misled the Senate during his confirmation proceedings," the House release said.

Porteous was appointed to the federal bench in 1994.

In 2007, after an FBI and federal grand jury investigation, the Justice Department alleged "pervasive misconduct" by Porteous and evidence "that Judge Porteous may have violated federal and state criminal laws, controlling canons of judicial conduct, rules of professional responsibility, and conducted himself in a manner antithetical to the constitutional standard of good behavior required of all federal judges."

The complaint said the department opted not to seek criminal charges for reasons that included issues of statute of limitations and other factors. But Westling said the statute of limitations was not applicable.

An Impeachment Task Force held four hearings late last year that focused on allegations of misconduct by Porteous, including:

-- Involvement in a corrupt kickback scheme

-- Failure to recuse himself from a case he was involved in

-- Allegations that Porteous made false and misleading statements, including concealing debts and gambling losses

-- Allegations that Porteous asked for and accepted "numerous things of value, including meals, trips, home and car repairs, for his personal use and benefit" while taking official actions on behalf of his benefactors

-- Allegations that Porteous lied about his past to the U.S. Senate and to the FBI about his nomination to the federal bench "in order to conceal corrupt relationships," Schiff said in his floor statement as prepared for delivery

Porteous was invited to testify, but he declined to do so, Schiff said. "His long-standing pattern of corrupt activity, so utterly lacking in honesty and integrity, demonstrates his unfitness to serve as a United States District Court judge," he said.

Porteous, 63, has not worked as a judge since he was suspended with pay in the fall of 2008, Westling said.

The last federal judge impeachment occurred last year, when Judge Samuel B. Kent of the U.S. District Court for the Southern District of Texas resigned after being impeached on charges of sexual assault, obstructing and impeding an official proceeding, and making false and misleading statements, according to the Web site of the Federal Judicial Center.

The Senate, sitting as a court of impeachment, dismissed the articles.

Before then, Judge Walter L. Nixon of U.S. District Court for the Southern District of Mississippi was impeached in 1989 on charges of perjury before a federal grand jury. The Senate convicted him and removed him from office that year.